1. High - tech solar panels are built - in, allowing for direct use of solar energy for charging without the need for additional batteries, which helps save a significant amount of energy. It is practical and environmentally friendly, taking approximately 5 hours to fully charge in sunlight. 2. High - efficiency and safety: The solar mole repeller vibrates and generates approximate sound waves. This ultrasonic solar repeller can be effective against pests such as cockroaches, rats, mice, and snakes. By vibrating and emitting sound waves between 400 and 1000 hertz, it stimulates the central nervous system of mice. It is quite efficient in eliminating moles and rats and can repel destructive rodents such as moles, snakes, and other rodents. 3. Harmless to humans and pets: The mole repeller emits a 2 - second pulse every 30 seconds, generating vibration and sound waves to drive away moles and deter animals such as rats, moles, voles, and gophers. It does not use soil - damaging chemicals. This mole repeller is generally harmless to humans and pets and can also repel voles. 4. Wide range of action: This solar mole repeller is powerful and effective. The device works in a circular pattern, with an action range of around 15 meters and a coverage area of up to approximately 650 square meters. For better results, it is recommended to install 2 to 4 devices every 100 meters in your garden or yard.